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General Description
The DS12R885 is a functional drop-in replacement for
the DS12885 real-time clock (RTC). The device pro-
vides an RTC/calendar, one time-of-day alarm, three
maskable interrupts with a common interrupt output, a
programmable square wave, and 114 bytes of battery-
backed static RAM. The date at the end of the month is
automatically adjusted for months with fewer than 31
days, including correction for leap years. It also oper-
ates in either 24-hour or 12-hour format with an AM/PM
indicator. A precision temperature-compensated circuit
monitors the status of VCC. If a primary power failure is
detected, the device automatically switches to a back-
up supply. The VBACKUP pin supports a rechargeable
battery or a super cap and includes an integrated,
always enabled trickle charger. The DS12R885 is
accessed through a multiplexed byte-wide interface,
which supports both Intel and Motorola modes. The
DS12CR887 and DS12R887 integrate the DS12R885
die with a crystal and battery.
Applications
Embedded Systems
Utility Meters
Security Systems
Network Hubs, Bridges, and Routers
Features
o Trickle-Charge Capability for a Rechargeable
Battery or Super Cap
o Selectable Intel or Motorola Bus Timing
o RTC Counts Seconds, Minutes, Hours, Day, Date,
Month, and Year with Leap-Year Compensation to
2100
o Interrupt Output with Three Independently
Maskable Interrupt Flags
o Time-of-Day Alarm is Once-per-Second to Once-
per-Day
o Periodic Rates from 122s to 500ms
o End-of-Clock Update Cycle Flag
o 14 Bytes of Clock and Control Registers
o 114 Bytes of General-Purpose Battery-Backed NV
RAM with Clear Input
o Programmable Square-Wave Output
o Automatic Power-Fail Detect and Switch Circuitry
o +5.0V or +3.3V Operation
o Industrial Temperature Range
o DS12CR887 Encapsulated DIP (EDIP) Module with
Integrated Battery and Crystal
o DS12R887 BGA Module Surface-Mountable
Package with Integrated Crystal and
Rechargeable Battery
19-5217; Rev 7; 9/13
DS12R885/DS12CR887/
DS12R887
RTCs with Constant-Voltage Trickle Charger
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
DS12R885
DS83C520
±
R/W
AS
GND
X2
X1
VCC
CRYSTAL
DS
VBACKUP
SUPER
CAP
AD(0–7)
SQW
RESET
IRQ
RCLR
CS
MOT
Typical Operating Circuit
PART
TEMP RANGE
PIN-
PACKAGE
TOP MARK*
DS12R885S-5+
-40°C to +85°C
24 SO
(300 mils)
DS12R885-5
DS12R885S-5+
T&R
-40°C to +85°C
24 SO
(300 mils)
DS12R885-5
DS12R885S-33+ -40°C to +85°C
24 SO
(300 mils)
DS12R885-33
DS12R885S-33+
T&R
-40°C to +85°C
24 SO
(300 mils)
DS12R885-33
DS12CR887-5+
-40°C to +85°C
24 EDIP
(700 mils)
DS12CR887-5
DS12CR887-33+ -40°C to +85°C
24 EDIP
(700 mils)
DS12CR887-33
DS12R887-5
-40°C to +85°C 48 BGA
DS12R887-5
DS12R887-33
-40°C to +85°C 48 BGA
DS12R887-33
Pin Configurations appear at end of data sheet.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
T&R = Tape and reel.
*
A “+” anywhere on the top mark indicates a lead(Pb)-free
device.
Ordering Information
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相关代理商/技术参数
DS12R885-33 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK MULTIPLEXED 114BYTE - Bulk
DS12R885-5 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK MULTIPLEXED 114BYTE - Bulk
DS12R885S-33 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
DS12R885S-33/T&R 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK MULTIPLEXED 114BYTE 24SOIC W - Tape and Reel
DS12R885S-33+ 功能描述:实时时钟 RTC w/Constant V Trickle Charger RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube
DS12R885S-33+T&R 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK MULTIPLEXED 114BYTE - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC RTC W/RAM 128 BYTE 24-SOIC
DS12R885S-33+T&R 功能描述:实时时钟 RTC w/Constant V Trickle Charger RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube
DS12R885S-5 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK MULTIPLEXED 114BYTE 24SOIC W - Bulk